That's a fairly aggressive cadence for 22 days. I would definitely recommend a cooling off period after that first "burst". As for how long you should wait, I would say that depends on a few factors. For starters, what is the length of your typical sales cycle? Is the above designed for brand new leads? Do you have a standard SLA for this stage in the Lifecycle/RCM? Do you have a "Recycle" stage in your Lifecycle/RCM?
For your second question about the type of content, I would agree with your statement above. They should start down an entirely new nurture stream based on content they had some interest in previously. To that point though, is the above "burst" also sending them content related to something they previously had interest in? If not... why not?